There are actally no good numbers on this topic as it's essentially impossible to correct for human behavior. So I just quoted Dan Savage. (I'm a bad man).

So lets take your numbers. Instead of all marriages, you've established that 22.7 percent of males and 11.6 percent of females cheat. The probablity that any one marriage has both parties as cheaters is now what (I suck at this), some number in the three precent range. (of the 22.7 percent of men who cheat, eleven point six percent of their wives also cheat so we can say that nineteen percent of cheating men are solo cheaters. And the revers for women so eight percent of women are solo cheaters. Eight plus Nineen is Thirty-Seven.

So Thirty-Seven percent of all people have or will cheat on their spouse while not being cheated upon in return. And that's using your numbers.

So given the old maxim that almost everybody lies about things they think will make them look bad, this thrity-seven percent are basically the "proud" and/or "don't care" cheaters.

I would feel safe doubling that number to accommodate the "scared to admit" and "self denial" cheaters as well. plus we have to go get that six-ish percent back out of the wash for the double-cheating relationships.

It's pure folly to imagine that sixty something cheating rate we can gusess at isn't a thing.

But even if its not, the 37% rate is significant enough to suggest an evolutionary pressure is at work.

And here is a thing to keep you up at night. That disparity between men and women admitting to cheating? For most of history it's fatal for them (women) to get caught cheating. So the evolutionary pressure is actually for them to be better at hiding the indiscretion, they are evolutionary more predisposed to lie on the survey.

But the women doing the cheating pretty much must be on parity to the men because otherwise who are the men cheating with. Particularly in societies where sex workers are limited and single women are disenfranchised.

Indeed in studies of other higher primates the female "cheats" way more than the male. (yes, other monkeys and apes have mating norms and can also cheat on those norms.)

So you got me, I quoted Dan Savage instead of hard numbers.

But the real numbers pretty much stand behind the nearly global estimate.

Some citation rich food for thought that I just scraped off the bottom of the internet (but it's got footnotes and a cartoon... 8-)

https://www.msu.edu/~lindsa57/